Sensor Cleaning; Pid Sensor / Lamp Diagnostics - WatchGas NEO Service Manual

NEO Photoionization Detector Service Manual
D e t e c t i o n D e t e c t i o n

2.1.2 Sensor Cleaning

1. Unscrew the sensor cap.
2. Pull the sensor straight out, using a slight rocking motion if
necessary.
3. Put the sensor into a beaker and cover it with pure methanol or
ethanol.
4. Put the beaker into an ultrasonic cleaning bath and sonicate for
5 minutes. Then replace the alcohol with distilled water and soni-
cate for 2 minutes. Lastly, take out sensor and dry it. If possible, use
a gentle stream of clean air to blow the residual liquid out of the
sensor.
5. Always re-calibrate the PID after cleaning the sensor.

2.1.3 PID Sensor / Lamp Diagnostics

In general, the strength of a PID sensor is best assessed by observing the noise level of the PID readings.
If response is noisy or weak, the unit should first be checked for a dirty filter or sample train, and then
cleaned and calibrated as needed. The PID can still be used as long as the resolution meets the needs of
the user's measurements, even if the diagnostic readings are outside the values given below.
PID raw signals can be accessed for aid in troubleshooting lamp/sensor problems. Connect the instru-
ment to WatchGas Suite on a PC or the mobile App, check the "Enable Diagnostic" box in the Configu-
ration screen ("General" section), and send to the instrument. The table below lists typical readings for a
new lamp, sensor and instrument.*
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